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Hi,
The block thread on the engine is British Standard Pipe thread, which is different from the regular thread. I was able to find a Swagelok fitting on eBay and used a flexible stainless steel braided Teflon (Swagelok also) on the adapter into a bulkhead fitting I installed on the firewall. From there, 316 SS tube into the gauge.
Expensive, but it is not going to leave me stranded like the plastic nylon crap.
If you are having pressure problems, the first place to look is the oil filter. Is it Mann or Volvo branded? The check valves in filters like Fram often are defective out of the box and can cause problems. The other likely culprit is the o-ring on the oil pump lift tube.
http://www.unm.edu/~goatman/gauges.jpg
Goatman
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